package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setMealMapper;
    /*
    * 添加购物车
    * */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //判断当前商品是否已经存在
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        //如果存在，数量加1
        if(list!=null && list.size() > 0) {
            ShoppingCart shoppingCart1 = list.get(0);
            shoppingCart1.setNumber(shoppingCart1.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart1);
        }else {
            //如果不存在，添加到购物车
            Long dishId = shoppingCartDTO.getDishId();
            Long setmealId = shoppingCartDTO.getSetmealId();
            if(dishId != null) {
                Dish dish= dishMapper.getByid(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                Setmeal setmeal = setMealMapper.selectById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        return shoppingCartMapper.list(shoppingCart);
    }

    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteAll(BaseContext.getCurrentId());
    }
    @Transactional
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //获取当前商品id
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        //如果存在，数量减1
        if(list!=null && list.size() > 0) {
            ShoppingCart shoppingCart1 = list.get(0);
            //商品数量大于1，数量减1
            if(shoppingCart1.getNumber() > 1) {
                shoppingCart1.setNumber(shoppingCart1.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart1);
            }else {
                //如果数量等于1，删除购物车
                shoppingCartMapper.deleteDishByid(shoppingCart1.getId());
            }
        }
    }
}
